Speed-regulator



(No Model.) 7 3 Sheets-Sheet 1.

' C. E. BARRETT SPEED REGULATOR.

No. 369,272. Patented Aug. 30, 1887.

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3 Sheets-Sheet 2. O. E. BARRETT.

SPEED REGULATOR.

I Patented Aug. 80, 1887.

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(No Model.) 3 Sheets-Sheet 3 G. E. BARRETT.

QPEED REGULATOR.

Patented M 30, 1887.

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CHARLES BARREEQI, OF BRATTLEBOROUGH, VERMONT, ASSIGNOR TO B. F.HAXVKINSJ TRUSTEE, OF SPRINGFIELD, MASSACHUSETTS.

SPEED-REGULATOR.

SPECIFICATION forming part of Letters Patent No. 369,272, dated August30, 1887.

Application filed May 18,1887. Serial No. 238,585. (No model.)

To all whom it may concern.-

Be it known that 1, Cnannns E. BARRETT, a citizen of the United States,residing at Brattleborougii, in the county of Nindhani and State ofVermont, haveinvented new and useful Improvements in Speed-Regulatorsfor Machines, of which the following is a specification.

This invention relates to speed-governors, IO the obj not being toprovide animproved speedgoverning device which is attached to adriving-shaft which is used for driving dynamoelectric machines andothers which require to be run at a uniform speed and the inventionconsists in the peculiar construction and arrangement of the variousparts of the governor in connection with a shaft on which it is located,all as hereinafter fully described, and pointed out in the claims.

In the drawings forming part of this speci iication, Figure 1 is a sideelevation, partlyin section, of a speed-governor constructed accordingto my invention, said figure showing a portion of the shaft on which thegovernor is located and one of the bearings for said shaft. Fig. 2 is anend elevation of the governor, showing the shaft on which it is locatedin section. Figs. 3 to 7 illustrate detail parts of the machine, ashereinafter fully described.

In the drawings, 2 indicates a shaft such as is ordinarily connected toa steaniengine or other motor, and through which motion is imparted tosome machine through suitable pul leys or gearing. In this case,however, the pulley through which connection is made between said shaft2 and a machine to be driven thereby is fixed on a part of the governor,and the latter is adapted to have an automatically operating frictionalconnection with said shaft 0 2, which is variable, according to thepower which is required to be transmitted by said shaft to maintain auniform speed in said machine, which is connected with the governor. Onsaid shaft 2 is fixed a pulley, 3, whose rim .1. 5 and portions of itsarms are shown in Fig. 2, Fig. 1 also showing in dotted lines the huband two of the arms thereof. A box-bearing, 20, for shaft 2 is fixed ona suitable support a little removed from one side of said pulley 3, andsaid box-bearing iucloses one end of a sleeve, 21, through which theshaft 2 passes freely, and in which it rotates, said sleeve beingrigidly held in said bearing, and the purpose thereof will be fullydescribed farther on. A circular face-plate, 6, having a long hollowhub, b, is placed on the shaft 2, and has the pulley 7 keyed thereonrigidly.

Two friction clamp-straps, 4, of suitable metallic construction,preferably of brass or con1- position metal, are pivoted on a stud,5,which is rigidly secured by one end to the face-plate 6. One of saidclamp-straps is shown in perspective view in Fig. 6 and in sideelevation in Fig. 7, the latter figure showing theinterior side of saidstrap. To provide a desirable bearing-surface for the inner side of saidstraps 4, so that they may be employed to the best advantage withoutusing oilor otherlubricant between them and the surface of said pulley3, against which they frictionally act, the said inner surfaces of thestraps have inserted in suitable sockets therein the well-knownmetalline pellets 0, whose outer ends constitute the bearing-surface ofsaid straps. Said straps 4 encircle the pulley 3, as shown in Fig. 2,and the ends of said straps opposite those which are pivoted on stud 5,as aforesaid, are united by a right-and-left-hand screw, 17, havingfixed on one end thereof a worm-gear, 18. Said screw 17 passes throughthe end of a stud, 19, by which it is supported, said stud being securedby one end to the face-plate 6.

A combined bracket, 8, and brace 9 (illustrated in perspective view inFig. 5) has the end of said brace secured to the end of theabove-mentioned stud 5, which is fixed in the face-plate 6, and the endof the bracket 8, having a perforated plate, (I, thereon, is bolted tothe side of said face-plate, said bracket extending from the side ofsaid plate in a direction across the rim of the pulley 3, but somewhatremoved therefrom, and having formed on a part thereof two bearings, c,in which is hung a shaft, 10, in a line substantially at right angles tothe main shaft 2. The said shaft 10 has on one end a worm, 12, and onits oppo site end, or that nearest shaft 2, an annularlygroovedfriction-pulley, 13. The said bracket 8 has bearings formed therein ata: a: for the shaft 14, running substantially in aline parallel' to themain shaft 2, and on one end of said shaft 14 is fixed a worm-gear, 15,which engages with the aforesaid worm 12 on shaft 10. A worm, 16, isfixed on said shaft 14 between its bearings, and engages with theaforesaid worm-gear 18 on the end of the right-and-lefthanded screw 17which unites the ends of the friction-straps 4, as above described.

Afriction-wheel, 22, (illustrated in side elevation in Fig. 3 and insection in Fig. 1,) has a sliding keyed connection with the aforesaidsleeve 21, and is prevented by the key between it and said sleeve fromrotating; but it is capable of a longitudinal movement on the latter bymeans below described. The wheel 22 has a deeply-grooved periphery, asshown, the sides of which groove are outwardly inclined and have formedtherein a series of an nular grooves, 2, as clearly shown in Fig. 1, andthe hub of said wheel 22 (indicated by a in Fig. 3) has an annulargroove, y, therein, in which is placed a split collar, 23, (shown inperspective view in Fig. 4,) having bolt-holes in its opposite sides, asshown.

The aforesaid annularly-grooved frictionpulley 13, which is fixed to oneend of said shaft 10, occupies a position within the groove in theperiphery of said friction-wheel 22, between the above-described groovedsides of the groove in wheel 22. The said pulley 13 is cone-shaped ortapering to coincide with the inclined sides of the groove in wheel 22,but is of such diameter that when it occupies a central position in thegroove in the latter it has no engagement with wheel 22.

Two elbow-levers, 24, are each pivoted in the end of a stud, 25, whichis fixed by one end to said face-plate 6, said studs extending in linessubstantially parallel with the main shaft 2 and on opposite sides ofthe latter.

Said elbow-levers 24 extend from a point to the rear of the face-plate6, in aline with shaft 2, for a certain distance, as shown, and are thenbent at right angles, and their bifurcated ends (see Fig. 2) arepivotally connected to the said split collar 23. The ends of the saidstuds 25, to which the elbow-levers 24 are pivoted, as aforesaid,constitute the fulcrumpoints of said elbow-levers, and when the endsthereof opposite sides of pulley 3 are caused, as below described, toswing away from and toward the shaft 2 the friction-wheel 22, with whichsaid elbow-levers are connected through said split collar 23, is given asliding movement on the sleeve 21, whereby first one side and then theother of said groove in wheel 22 is brought into engagement with theopposite sides of the grooved friction-pulley 13. On each of saidelbow-levers 24 is adj ustably secured aweight, 26, which is capable ofbeing adjusted at a proper distance from the aforesaid fulcrum-point ofsaid elbow-lever, whereby when the governor attains a certain speed ofrotation the movement of said weights, under centrifugal force, willcause the elbow-levers to which they are attached to swing on theirfulcrum-points and operate the friction devices connecting the governorand the shaft 2, as below described.

On the rear side of the face-plate 6 are rigidly secured two projectingstuds, 1;, and between the ends of said elbow-levers 24 and saidstuds 1) are congected two springs, 27, which serve the purpose ofreturning said elbow-levers, by their retracting power, to their normalposition after having been swung outward by centrifugal force, asaforesaid, and to prevent any sudden outward movement of saidelbow-levers said springs are connected to the ends of the elbow-levers24 by a hook having a nut, a, thereon, whereby the tension of saidsprings relative to the elbow-levers 24 is suitably adjusted.

The operation of the above-described speedgoverning devices is asfollows: As above set forth, the main shaft 2 is given a continuousrotary motion by a suitable motor, like any of the ordinary shafts of amill, and the speedgovernor is applied to said shaft in themannerhereinshownanddescribed. Thedynarnoelectric or other machine to bedriven, and whose speed is to be regulated by the governor, is connectedwith the latter by a belt running on the pulley 7. The clamp-straps 4are adjusted by the screw 17 to have such a bearing on the surface ofthe pulley 3 as will permit the latter to slip more or less within theclamps when the governor and its attached machine are running at theirnormal or required speed, and when so adjusted the elbow-levers of thegovernor (indicated by 24, as aforesaid) and the wheel 22 and pulley 13occupy the relative position shown in Fig. 1. It will be rememberedthat, as above described, the said wheel 22 has no rotary motion, andthat the governor is rotated by the engagement therewith of the pulley 3on shaft 2, and consequently the pulley 13 is carried around within thegroove of the frictionwheel 22 by the rotary motion of the governor. If,now, the speed of the main shaft and the governor be increased beyondthat to which the governor is adjusted when started, elbow-levers 24,under the action of the centrifugal force acting on the weights 26,-will swing outward, producing a movement of the ends thereof, which areconnected to the hub of the wheel 22, which causes the latter to movetoward the pulley 3, thereby bringing one side of its groove against theside of the friction pulley l3, and causing the grooves and ribs of saidpulley to engage frictionally in the grooves and ribs on one side of thegroove in the wheel 22, whereby pulley 13 and its shaft 10 are given arotary motion, which rotary motion is imparted to the shaft 14, and thelatter, through its connection, as above described, with the screw 17,which ICC unites the ends of the clamp-straps 4, causes brings thegovernor back to its normal speed. A reduction of the speed of thegovernor below that to which it is set results in a movement of theweighted ends of the elbow-levers 24L inward or toward the shaft 2, andin a consequent reverse movement of the wheel 22 to that abovedescribed, whereby the pulley 13 and the described parts connectedtherewith are turned in a reverse direction to that first referred to,and the clamp-straps i are more tightly drawn against. the pulley 3, andconsequently the speed of the governor is again brought up to its normalstate.

What I claim as my invention is-- 1. A speed-governor for machines,consisting of a faceplate, substantially as described, capable ofrotation on a shaft and of carrying a machine driving pulley, afriction-wheel having a groove in its periphery capable of receiving africtionpulley between the sides thereof, supported opposite saidface-plate and capable of a longitudinal movement toward and from saidplate, a shaft, as 10, supported on a frame on said face-plate at rightangles to the axis of said friction wheel, having a pulley thereoncapable of frictional engagement with said wheel, two pivoted weightedelbowlevers, substantially as described, capable of vibratory movementsby centrifugal force, hav' ing their fulcrums on supports on said faceplate and engaging with said frictiou-wheel, two curved clamp-straps,substantially as described, having a pivotal support by one end on saidface-plate and capable of a frictional engagement with a rotatingpulley, a screw uniting the opposite ends of said clamp-straps andcapable of opening and shutting said straps, gear-connections,substantially as described, between said shaft 10 and said screw,whereby the rotary movements of said friction-wheel are communicated tosaid screw, and retracting-springs connected to said elbow levers,substantially as set forth.

2. A. speed-governor for machines, consist ing of the combination, witha suitable driving-shaft having a pulley fixed thereon, of a face plate,substantially as described, sup ported on said shaft and capable ofhaving a machine-driving pulley attached thereto, two frictionalclampstraps having a pivotal connection by one end to said face-plateand inelosing said pulley, a screw uniting the opposite ends of saidclamp-straps, a grooved friction-wheel, as 22, supported on a sleeve onsaid driving-shaft and capable only of a longitudinal movement thereon,two pivoted elbow-levers, each having a weight adjustably attachedthereto, substantially as described, capable of vibratory movements bycentrifugal force, having their fulerums on supports attached to saidface-plate and having an engagement with said wheel 22, afriction-pulley, as 13, capable of engagement with either side of thegroove in said longitudinally-moving frictionwheel, suitable shafts, andworm and gear connections, substantially as described, between saidfriction-pulley 13 and said screw, and retracting-springs connected tosaid elbow-levers, substantially as set forth.

3. The combination, in a speed-governor, of clamp-straps, as 4, pivotedtogether by one end, a screw, as 17, connecting the opposite ends ofsaid straps, a friction-wheel, as 22, having a groove in its periphery,a frictionpulley, as 13, supported on the end of a shaft, as 10, betweenthe sides of said groove, worm and gear connections, substantially asdescribed, between said shaft and said screw 17, and two weightedelbow-levers, substantially as described, capable of a vibratory motion,having an engagement with said friction-wheel to impart a movementthereto in a line with its axis, substantially as set forth.

4. The friction-wheel 22, having a groove in its periphery, in theopposite sides of which are formed one or more annular grooves, as .2,combined with a friction-pulley, as 13, having a diameter less than thewidth of said groove, and having one or more annular grooves in itssurface capable of interlocking with said grooves z, a shaft, as 10,support-ing saidpulley 13, a shaft, as 14, having connection with saidshaft 10, two clampstraps, as 4:, and a screw, as 17, uniting the endsof said straps, having an engagement, substantially as described, withsaid shaft 14, substantially as set forth.

CHARLES E. BARRETT.

Vitnesses:

H. A. Cniirrn, G. M. CHAMBERLAIN,

